Hello,
I am trying to write a usermat subroutine for Fung type material[1] in ANSYS,the constitutive form follows:
With the Help Document of ANSYS, I can easily model the isotropic hyperelastic material with the subroutine userhyper.F.
However, for anisotropic hyperelastic material, this doesnt work.
From the reference[2], I find that this can be done by subroutine usermat.F. But I cannot find something useful about
modeling hyperelastic material with usermat.F from the Help Document.
I really hope someone can offer me an example,so I can learn to write my own code.
Any help will be greatly appreciated.
Reference:
[1] Holzapfel, G. A., Gasser, T. C., & Ogden, R. W. (2000). A New Constitutive Framework for Arterial Wall Mechanics and a Comparative Study of Material Models. Journal of Elasticity and the Physical Science of Solids, 61(1-3), 148. doi:10.1023/A:1010835316564
[2]Biomechanical Face Modeling: Control of Orofacial Gestures for Speech Production. (n.d.). Retrieved January 12, 2015, from [url] http://membres-timc.imag.fr/Yohan.Payan/PhD/PhD_Manuscript_Nazari_2011.pdf [/url]
